button.btn {
  display: block;
  position: relative;
  top: 0;
  border: 0;
  cursor: pointer;
  background: #9ccc65;
  color: white;
  border-radius: 3px;
  line-height: 1;
  font-size: 16px;
  padding: 10px 15px;
  outline: 0;
  margin: 10px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);

  &.shiny {
    background: #007eaf;
    background: linear-gradient(-45deg, #2284fb 50%, #0a0e92 60%, #2e59d4 70%);
    background-size: 600% 100%;
    animation: shine 20s infinite;
    animation-delay: 0s;
    animation-timing-function: linear;
  }

  &.shinydarken {
    background: #9ccc65;
    background: linear-gradient(-45deg, #9ccc65 50%, #699833 60%, #9ccc65 70%);
    background-size: 600% 100%;
    animation: shine 20s infinite;
    animation-delay: 0s;
    animation-timing-function: linear;
  }
}





@keyframes shine {
  0% {
    background-position-x: 400%;
  }

  50% {
    background-position-x: 0%;
  }

  100% {
    background-position-x: -400%;
  }
}